I wouldn't be surprised, if that is what MC is thinking. In order to fix the situation, is to make the other personality also fall in love with him. That way, when the switch happens, it wouldn't be too troubling. Or it could just happen naturally, and the NTR bait will be between the...
What did you want him do? lol. Also, the MC is a chad, bro never brought up her past to her. He left it where is belonged, in the past. I mean, he basically got the gist of all of it, thanks to her old nosey neighbors; bringing it up to her would also cause emotional pain. Glad the FMC was...
Im probably going to be way off, what if that's not the rapist daughter, but one of his victims. what if the girl who was bullying her, is the actual daughter. Just got the impression from her, when she gazed back. I can't wait for next chapter.
Usually when authors pull this, it's kind of like the "Red Wedding" if you read a Song of Ice of Fire or watched Game of Thrones. It's a way of the author telling you, things are about to get worse from here on out.
I am going to guess, the girl has a split personality she developed. The replica is just the person she wants to be, and doesn't realize when she switches personalities.